Denser

iTrader: (2)

currently rocking a eldelbrock 1406 performer series carb and not happy with it, it feels like there's a lot of power but i am not really seeing it where its needed. i have a 6 port 13b slight street ported engine and just looking to see which is the best set up as of right now it looks like racing beat has some nice webbers and i did research on hear and found a couple of threads but i am still lost on which to choose for the best power output

rwatson5651

iTrader: (5)

In my view it depends on what you will use the car for, what exhausts system you have and where are you looking to make power. If you have a free flowing exhausts and to make the most of your ports you will need one of the larger carbs, 48s or so. If you are looking to make top end power then the down drafts work well cause the shorter manifolds tend to shift the power higher power band. Sometimes, however a car that makes little low end power is not to fun to drive on the street cause they can feel weak unless you are reving the hell out of it. The side draft set ups with a wrap aroun manifold yield better power lower and you dont have to rev them as much to see the power, but tend to have a stumble just off idle that can be difficult to tune out. A good compromise,that I dont think will work for you because of your six port motor is the Rotary Engineering twin downdraft 36 DCDs. They have progressive secondaries which allow you to cruise around on the primaries and then open up the secondaries when you need the power. The power band will still be higher than the wrap around manis imo however. Just depends on what you want.

2 cents

Denser

iTrader: (2)

kinda looking to make power in the lower end. my set up now i dont see much power unless im cruising at highway speeds most cars have me on straight aways and a stop start its only on corners and highspeeds that you can notice i have any real power but i kinda dislike it. i want more of something that accelerates at a high pace. at the moment i have a borla muffler with a 2.5 pipe leading to the racing beat silencer and headers would a webber really make that much power difference or should i look into getting a turbo or swapping out the 13b i have in it now

objautomotive

How about turning your car to profesional rotary engine master technician and let them do the tuning for you?

Denser

iTrader: (2)

kinda want to do it myself. the only thing id probably get someone else to do is Bridgeport the engine but i wanna be able to say i race a car that i built myself

reo

iTrader: (4)

I have a 13b in a 1400lb car with a 48 weber side draft, it still has the stumble accelerating at low speeds but my understanding is that with a zero bypass or return in the accelerator pump will cure that. otherwise it has good manners although you need to act as your own progressive by easing into the throttle. and a wide-band is very useful for tuning carbs. also.

reo

iTrader: (4)

also would add- if i could find a good tuner near i would use them , and if it were my choice it would be a dell 48, but i am living with what i have as it is getting a t2 engine soon.

Rotor_Venom08

iTrader: (3)

http://www.motorator.com/blog/hot-ro...tion-induction

use the weber throttle bodies. lol go EFI

Denser

iTrader: (2)

where could i buy a set up like this

j9fd3s

iTrader: (3)

keep tuning! the stumble is the transition between the idle circuit and the main circuit. a different (probably smaller) air corrector might be the fix.

you should be able to get the car to drive like its got factory EFI.

rwatson5651

iTrader: (5)

If the stumble occures immediately upon the application of the throttle it is in my opinion an accelerator pump issue. I cured mine by tweaking the accel pump to deliver the maximum amount of fuel that starts with the slightest application of throttle. I added gaskets to the pump chamber to increase capacity and adjusted the linkage beyound what the webber book called for to help take out ALL of the freeplay in the accelerator pump likage. after that is was like j9fd3s says,ran like it was an EFI.

Denser

iTrader: (2)

thinking about going this route

reo

iTrader: (4)

Thanks, will work on the pump circuit. it is amazing how you get more in return than you give.

Rotor_Venom08

iTrader: (3)

http://www.racetep.com/weberfi.html


many different way to go about doing this i know jenvey makes them, deltoro, just have to look around.